On display outside a French High School, there’s what is claimed to be the world’s largest key. The key measures around 10.5 metres long, although may have lost its title earlier this year when Bethlehem claimed the crown1. It’s still impressive, especially in the fact that it’s completely useless. Not as large, but much more mysterious, is a 8.5m key lying around a carpark in Denver. This key doesn’t appear on Live Search Maps2 or the Google Street View imagery, so it was either dropped by a careless giant, or isn’t a key at all. So what is…